Had my car back a week following engine conversion at LAD. Must say i am really pleased with it. Took some in gear times just with a stopwatch on the speedo and seems to be a fair bit quicker than a standard cup and the engine is likely to be still quite tight with only 1200 miles on it. Subjectively I would say performance was similar to a mk3 Subaru WRX but not quite as quick as my previous car an original Subaru Turbo. There do not appear to be any downsides as car idles perfectlly and seems better throughout the rev range. Claimed power is about 168 at the wheels 200 the crank and you just leave your car for a week. Throttle bodies or a supercharger may be even better but this is a no hassle option that I would definitely recommend. I think there is a review of the LADs own car coming up in Car & Car Conversions or go and visit them in Morcambe and see what you think.